Interchangeable sandpaper device



Jan. 13, 1948. w. FINKELSTEIN 2,434,356

INTERGHANGEABLE SANDPAPER DEVICE Filed July 27, 1946 2 Sheets-Sheet l INVENTORQ WILLIAM FINKELSTEIN BYYW A TTORNEY Jan. 13, 1948. w. FINKELSTEIN INTERCHANGEABLE SANDPAPER DEVI CE Filed July 2'7, 1946 2 Sheets-Sheet 2 IN V EN TOR. WILLIAM FINKELS TEIN ATTORNEY Patented Jan. 13, 1948 STATES PATENT OFFICE 2,434,356 INTERCHANGEABLE SANDPAPER Dii'vioE William Finkelstein, Rye, N. Y. Application July 27, 1946, Serial No. 686,681

8 Claims. 1

The present invention relates to a sandpaper holding device and refers more particularly to a tool for holding a length of sandpaper in extended operative position on a mount, said mount being detachable from the handle portion of the tool.

An object of the present invention is the provision of novel means for attaching sandpaper to a hand tool for sanding.

A further object is that the portion of the tool to which the paper is attached shall be quickly detachable from the handle portion of the tool in order that different mounts of garnet paper, sandpaper, or emery cloth of a different size grit may be interchanged for greater convenience in performing various sanding operations, thus making it possible to use any number of mounts.

Another object is that the described tool shall be compact.

Still another object is that the tool shall be absolutely sturdy and reliable.

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawings, and to the appended claims in which the various novel features of the invention are more particularly set forth.

In the accompanying drawings forming a material part of this disclosure:

Fig. 1 is a perspective view of a tool embodying the present invention.

Fig. 2 is a side elevation of the same.

Fig. 3 is an end elevation of the same.

Fig. 4 is a section on the line 4-4 of Fig. 2, the portions of the tool being locked together.

Fig. 5 is similar, the portions being unlocked.

Fig. 6 is a section on the line 66 of Fig. 5.

Fig. 7 is an enlarged fragment of the same.

Fig. 8 is an exploded perspective view of the paper gripping members in Fig. 7.

Fig. 9 is a section on the line 39 of Fig. 4.

Referring now in detail to the drawings, the sander |5 comprises two main portions. The handle portion l6 comprises a plate shaped body portion ll carrying handle |8, knob l9 and the locking nut 26 on shaft 2| journalled in the body portion l! and bearing on its opposite end the dual cam 22. Formed integral with body plate H or attached thereto in any convenient manner is the substantially rectangular flange portion 23, the four walls of which extend perpendicularly to plate flange 23 further being symmetrically disposed relative to plate ll in that its respective walls are parallel to the respective adjacent borders of plate ll.

The paper mounting portion 24 of the tool it comprises a substantially flat or plate shaped portion 25 generally similar to plate I1 and comprising a flange 26 similar to flange 23 and extending parallel and close around the latter. A pad 21 of rubber or other soft material is affixed to the under side of plate 25 by means of internally threaded metal inserts 25 molded in the pad at the time of manufacture, and for which corresponding openings are provided in plate 25. Screws within holes in plate 25 are threaded into these metal inserts 25 for the purpose of hold ing them steady and immovable. V V

The sandpaper 30, emery cloth, garnet paper or other similar material is held in stretched or extended operative position on paper mounting portion 24 by means of gripping mechanisms 28 located on plate 25 exteriorly of flange 26 and in the recesses 29 formed between plates I1 and 25 by reason of their spaced relation due to the interposed flanges 23 and 26.

Gripper mechanisms 28 comprise the jaws 3| and 32 comprising parti-cylindrical pivot bearing portions 33 and 34 bearing on pivot roller 35 and resiliently urged thereagainst and into gripping engagement with each other by the parti-cylindrical spring 36. Cylindrical studs 31 have top surfaces slanting upwardly and inwardly so as to punch holes in the sandpaper 36 in coaction with jaw member 31 formed with holes 38 complement tary to studs '31. If, however, the paper used is of exact size with the four holes already punched this attachment may be made more easily. A lip member 39 on jaw 3| affords easy purchase thereof in disengaging the jaws so as to release the sandpaper.

Flanges 23 and 26 are formed with coincident laterally opposite horizontal 'slots 46 near their ends and flange 26 further is formed with vertical slots 4| intersecting the slots 46 at their inner ends. Pins 42 extend laterally of the tool l5, each pin 42 extending through four of the slots 4|] and being slidable longitudinally thereof. EX- tension springs '43 join pins 42 together and res'il iently urge them toward each other and toward the vertical slots 4|. In Fig. 5, pins 42 are coincident with slots 4| and consequently the handle portion l6 may be withdrawn from the paper mounting portion 24, pins 42 travelling upwards along slots 4| and finally out thereof. In Figs. 1, 2, 4 and 6, cam 22 actuated through locking nut 2|] has moved the pins 42 outwardly along slots 40 to lock the portion l6 and 24 together.

While I have illustrated and described the pre- 65 ferred embodiments of my invention, it is to be understood that I do not limit myself to the precise constructions herein disclosed and the right is reserved to all changes and modifications coming within the scope of the invention as defined in the appended claims.

Having thus described my invention, what I claim as new, and desire to secure by United States Letters Patent is:

1. In a sanding device, a paper mounting portion, a handle portion, means mounted on said two portions and adapted to detachably lock them together, said means comprising complementary substantially rectangular flanges mounted on each portion, a pin mounted so as to slide in a slot in the inner flange of said flanges, means for actuating said pin in one direction in said slot and resilient means urging said pin in the opposite direction, and a slot formed in the outer ofsaid flanges and in which said pin is slidable to' lock said portions together and to unlock the same.

2. In a sanding device, a paper mounting portion, a handle portion, means mounted on said two portions and adapted to detachably lock them together, said means comprising a substantially rectangular outer flange portion comprised by said paper mounting portion, a substantially rectangular inner flange portion comprised by said handle portion and fitting within said outer flange portion, said flange portions being formed with coincident horizontally extending slots, said outer flange portion being formed with a vertically extending slot intersecting said horizontal slot, a pin extending laterally through said horizontal slots and slidable longitudinally thereof, resilient means urging said pin into coincidence with said vertical slot and means actuatable to positively move said pin out of coincidence with said vertical slot whereby said handle and paper mounting portions are locked together.

3. In a sanding device, a paper mounting portion, a handle portion, means mounted on said two portions and adapted to detachably lock them together, said means comprising a substantially rectangular outer flange portion comprised by said paper mounting portion, a substantiall rectangular inner flange portion comprised by said handle portion and fitting within said outer flange portion, said flange portions being formed adjacent their ends with pairs of laterally oppo site horizontally extending slots, the slots of the respective flanges being coincident, a laterally extending pin slidable longitudinally in said coincident slots at each end of said flange, springs interconnecting said pins and urging, them together, cam means actuatable to move said pins apart to lock said handle and said paper mounting portions together, and vertical slots formed in said outer flange intersecting said horizontal slots at the inner ends thereof to permit disengagement of said two last mentioned portions.

4. In a sanding device, in combination with a paper mounting member, paper gripping means comprising coacting jaw members, one of said jaw members comprising a stud member, the other of said jaw members being formed with a hole adapted to receive said stud, means pivotally mounting said other member relatively to said first mentioned jaw member, and resilient means urging said jaw members into gripping relation.

5. In a sanding device, in combination with a paper mounting member, paper gripping means comprising coacting jaw members, one of said jaw members comprising a stud member. the other of said jaw members being formed with a hole adapted to receive said stud, means pivotally mounting said other member relatively to said first mentioned jaw member, and spring means urging said jaw members into gripping relation.

6. In a sanding device, in combination with a paper mounting member, paper gripping means comprising coacting jaw members, one of said jaw members comprising a stud member, the

' other of'said jaw members being formed with a hole adapted to receive said stud, means pivotally mounting said other member relatively to said first mentioned jaw member, and parti-cylindrical spring means urging said jaw members into gripping relation.

7. In a sanding device, in combination with a handle member and paper mounting member, said members each comprising a substantially flat body portion and a perpendicularly extending flange portion, said flange portions being adapted to interengage and to lock said body portions together in spaced relation, paper gripping means located exteriorly of said flange portions and between said body portions, said paper gripping means comprising coacting jaw members, one of said jaw members comprising a stud member, the other of said jaw members being formed with a hole adapted to receive said stud, means pivotally mounting said other member relatively to said first mentioned jaw member, and resilient means urging said jaw members into gripping relation.

8. In a sanding device, in combination with a handle member and. paper mounting member, said members each comprising a substantially flat body portion and a perpendicularly extending flange portion, said flange portions being adapted to interengage and to lock said body portions together in spaced relation, paper gripping means located exteriorly of said flange portions and between said body portions, said paper gripping means comprising coacting jaw members, one of said jaw members comprising a stud member, the other of said J'aw members being formed with a hole adapted to receive said stud, means pivotally mounting said other member relatively to said first mentioned jaw member, and parti-cylindrical spring means urging said jaw members into gripping relation.

WILLIAM FINKELSTElN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,012,479 Thomas Dec. 19, 1911 1,067,280 Smilovetz July 15, 1913 1,520,642 Giroux Dec. 23, 1924 1,722,359 Thomas July 30, 1929 2,036,107 Thomas Mar. 31, 1936 

